Commutator and holding means therefor.



C. W. DAKE.

COMMUTATOR AND HOLDING MEANS THEREFOR.

APPLICATION FILED SEPT-21.19M-

A five 722507". Uias'rzefi Wi er/36, W

To all whom it may concern N it known "1, CHARLES citizen. of the United States, 1 ergo the con f 1g inn; is a specification, My invention rela oin rnutators and l I w l s for one object r oved structure where held i and "session on rotor shaft.

rovide means for snpportin i icing the commutator so that out of position or he distorted uncle.

1v speee conditions.

-. modified form wherein the commutator ld at four places instead of three he parts are indicated by li e characters a l the figures it is the rotor shaft. It carries the usual armature A rotating" in a field A and is mounted at its outboard end in a hearing A supported on a bracket All this is the usual electric machine construction.

B is a base sleeve adapted to be slidably placed in position on the shaft and to abut the shoulder B B is a nut screw-threaded on the end of the shaft A adapted to engage the opposed end of the sleeve B and when tightened to lock it in position. The sleeve B is flanged at its inboard end as at B and this flange is cut away, dovetailed, or tapered as at B B is a commutator mounted on the base sleeve B made up of a plurality of is section similar to Fig. 1 show u A; an inwardly tapered at one end at the other sleev These orought together a cvlindrical are so pro-- 1 hetween by mica hing" sleev or is co: ative size of t tor seats s I'llillfillill interposed ipporting and loch C is central holdin gig; on the sleeve snugly withh commu tor".

LC en ug it in turn carries tapered as at C on the outboard end The sleeve C is scre-"r-th l gaged by an outer loclr l'lllb C adaoted to thrust the outer sleeve invv'irely and the sleeve is screwthreaded at engaged by the central lock nut C adapted to thrust the sleeve 0 inwardly. The lock nuts E C and Q are all of them separate in their operation and never engage one another. C

is )ut on first C next and then B and the .1

are then tightened up inversely first B then C and then C to lock the parts successively in position and hold the commutater on it.

D D are brushes adapted to engage the commutator in the usual manner being supported by conducting arms D and provided with a binding post I) to which lead the usual conductors D whence the current is controlled in the usual manner not here indicated.

In the modified form shown in Fig. 3 I have shown two central locking sleeves. The

commutator instead of being made with two varying interior diameters is made with three. base sleeve, the neXt largest diameter engages the larger sleeve, the next diameter engages a still larger sleeve. These two sleeves each of them engage tapers of different diameters on the inside of the commutator so that the commutator bars are each of them held down at two points intermediate their ends. This ordinarily would not be necessary but in the event of the large machine or machine traveling at exceedingly high rotational speeds it might be desirable to have four or even more points of anchorage on the commutator bars instead of three as indicated in my preferred form.

It will be evident that while I have shown in my drawings an Operative device, still many changes might be made both in size, shape and arrangement of parts without departing materially from the spirit of my invention and I wish, therefore, that my drawings be regarded as in a sense diagram matic.

The use and operation of my invention are as follows A commutator made up of alternate sections of mica for insulating and copper to form the conductor and previously bored out and shaped as indicated in the drawing is forced by the operator on to the sleeve onthe end of the commutator shaft. This sleeve is provided with the inner taper to overhang and engage the taper or hook on the inside of the inner end of the commu tator. The operator then slips on the central holding sleeve which has a central taper to overhang a central taper on the commutator. He then slips on the outer holding sleeve which is slidably mounted on the inner sleeve. He then starts the outer holding nut which is screw-threaded on the center sleeve and he then after the outer holding nut is in place screws the center holding sleeve nut in position. This is followed by the master nut which holds the base sleeve in position. This first nut is screwed up tight to jam the base sleeve firmly against the shoulder on the shaft and hold it steady. Then the center sleeve istightened up by rotation of the central end. Thisoperates to force the inboard and central tapers on the commutator rigidly against the hook portions overhanging them. The commutator is now held in position at two points, then the outer nut is tightened and the outer sleeve forced in place to engage the outer taper thus holding the commutator at three points. This is screwed down tight so that the commutator is first clamped at itsinner end and at its center. The outer nut is then screwed up so that the commutator is clamped at its outer end.

This gives three annular holding zones one The smallest diameter engages the at either end and one at the center of the commutator and makes it impossible for the commutator segments to bend or become dis placed even at the highest rotational speeds.

the brushes is likely to ensue. It might be possible to substitute for the separate sleeve and nut a sleeve with a nut integral therewith but, of course, while simplifying the manufacture of the sleeve and nut the soft commutator bars might be damaged by the rotation of the sleeve engaging them.

I claim l. A commutator comprising a' hollow cylindrical body having a plurality of different internal diameters and a plurality of tapers associated therewith, a plurality of sleeves of different diameters upon which the commutator body is mounted said sleeves having each of them one taper in opposition to one of the tapers on the commutator body, separate and independent means for forcing each of said sleeves longitudinally against the commutator body to lock the tapers. together.

A commutator comprising a hollow cylindrical body having a plurality of different internal diameters and a plurality of tapers associated therewith, a plurality of sleeves of difierent diameters upon which the commutator body is mounted said sleeves having each of them one taper in opposition to one of the tapers on the commutator body,

separate and independent means for forcing each of said sleeves longitudinally against thebommutator body to lock the tapers together said means comprising a plurality of nuts screw-threaded on said sleeves adapted to engage the ends thereof.

3. A commutator comprising a base sleeve flanged and having a taper, a commutator body mounted thereon and having a taper in opposition to the taper on the flange, a central locking sleeve mounted slidably on the base sleeve the commutator body being enlarged to permit penetration of the locking sleeve and provided with a taper intermediate its ends at the inner portion of the enlargement the sleeve being provided with a taper to engage the opposed taper on the commutator, a nut screw-threaded on the base sleeve adapted to force the inner sleeve against the taper the outer end of the commutator body being tapered, a sleeve slidable on the central sleeve taper in opposition to the outer taper and a nut screwthreaded on force the out tutor body.

1. A commutator comprising hollow eylincli'ical bodyliaving a, plurality of clifierent internal diameters, and a plurelity of tapers associated therewith e plurality of supporting sleeves of different diameters izeoii which the commutator body is mounted, I sleeves having each of hem one taper in 0; position to one of the tapers oil-the commutater body e plumlisy 01" said eoniimitetor engaging supporting sleeves adapted to be inserted into the commutator body from the same clirectionp 5. commutator comprising a hollow eyllIlClllCiil body having a plurality of difierent internal diameters, and a plurality of tapers associated 'tlieiewitli a plurality of supporting sleeves of difiei'ent diameters upon which the cominutetoi' body is mounted, said sleeves having each of them one taper in opposition to one oi the tapers on the commutator oocly a oluiality of said. commutetoi engaging supporting sleeves adap ed. to l the commute-tor body ii'oii be insert c the same direction, separate and ind e means fo forcing each of said sleeves gituclinelly against the eoiiir i to lock the taper" togethe: $2-5 A prisi; g e plurality of nuts serew on said sleeves adapted. to engage tlieteofi A e eompiisi ig L llIlflflCill bOQjllaVlLg plurelh position to one 01 body, a lurs me clireetie:1. es s mes s fo tucli 1 V look urelity oi "'Pslity of a L tliemete testimony Wli 

